Function testReturnCalled

deps/v8/test/mjsunit/iterable-foreach.js:42–65

(iterableFactory)

// Exception handling and 'return' method
function testReturnCalled(iterableFactory) {
  let returnCalled = false;
  let iterable = iterableFactory();
  let iterator = iterable[Symbol.iterator]();
  let originalIterator = iterator;

  // Wrap the iterator to intercept 'return'
  iterable[Symbol.iterator] = () => {
      originalIterator.return = () => {
          returnCalled = true;
          return { done: true };
      };
      return originalIterator;
  }

  try {
    %IterableForEach(iterable, (x) => {
      throw new Error("Stop iteration");
    });
  } catch (e) {
    assertEquals("Stop iteration", e.message);
  }
  assertTrue(returnCalled, "Iterator.return() should be called");
}

// Test with custom iterable
testReturnCalled(() => ({